$.fn.imgscroll = function (o) {
	var defaults = {
			speed: 40,
			amount: 0,
			width: 1,
			dir: "left"
	};
	o = $.extend(defaults, o);

	return this.each(function () {
			var _li = $("li", this);
			_li.parent().parent().css({ overflow: "hidden", position: "relative" }); //div
			_li.parent().css({ margin: "0", padding: "0", overflow: "hidden", position: "relative", "list-style": "none" }); //ul
			_li.css({ position: "relative", overflow: "hidden" }); //li
			if (o.dir == "left") _li.css({ float: "left" });

			//初始大小
			var _li_size = 0;
			for (var i = 0; i < _li.length; i++)
					_li_size += o.dir == "left" ? _li.eq(i).outerWidth(true) : _li.eq(i).outerHeight(true);

			//循环所需要的元素
			if (o.dir == "left") _li.parent().css({ width: (_li_size * 3) + "px" });
			_li.parent().empty().append(_li.clone()).append(_li.clone()).append(_li.clone());
			_li = $("li", this);

			//滚动
			var _li_scroll = 0;
			function goto() {
					_li_scroll += o.width;
					if (_li_scroll > _li_size) {
							_li_scroll = 0;
							_li.parent().css(o.dir == "left" ? { left: -_li_scroll } : { top: -_li_scroll });
							_li_scroll += o.width;
					}
					_li.parent().animate(o.dir == "left" ? { left: -_li_scroll } : { top: -_li_scroll }, o.amount);
			}

			//开始
			var move = setInterval(function () { goto(); }, o.speed);
			_li.parent().hover(function () {
					clearInterval(move);
			}, function () {
					clearInterval(move);
					move = setInterval(function () { goto(); }, o.speed);
			});
	});
};